Type-bar action.



S. L. KAUFMAN.

TYPE BAR ACTION.

APPLICATION FILED NOV. 18. 1914.

Patented May 28, 1918.,

WITNESSES SYDNEY L. 'KAUFMANMOF KIrrAnnrnG, PENNSYLVANIA.

TYPE-BAR ACTION;

Specification of Letters Patent. 1 Patentedllway 28, 1918.

Application filed November 18, 1914 Serial No. 872,765.

To all whom it may concern.

Be it known that I, SYDNEY I KlA UFMAN,

a citizen of the United States, residing at Kittanning, in the county of Armstrong and State of Pennsylvania, have invented a new and useful Improvement in Type-Bar Actions, of which improvement the following is a specification.

My invention relates to improvements in devices for operating the type bars of typewriting machines.

The object of my invention is to produce a device adapted to accelerate or quicken the movement of the type bars toward the platen at the finish of their stroke and a corresponding quick reverse movement away from the platen.

I accomplish this by means of, the device which consists of a self-contained flexuring bell crank pivotally connected intermediate the type bar and the key lever, and hereinafter more specifically described, reference being had to the accompanying drawings forming part thereof, in whiche Figure 1 is a diagrammatic view of the platen, type bar and key lever with connecting mechanism.

Fig. 2 is an enlarged detail of a modified form of the accelerating mechanism.

Fig. 3 is a front elevation of one end of the plate which supports the forked brackets within which the bell crank levers 7 are pivotally mounted.

Fig. 4 is a top plan view of an end portion of the said plate, showing the manner of securing the forked brackets thereto.

Referring to said drawings, 1 is the platen, 2 is the type bar and 3 is the key lever, the inner end of said type bar having a downwardly projecting member a to which is connected one end of the connecting rod 4, the rear end of said rod being connected to the upper end of the link 5, the rear end of which is pivotally connected to the member 6 of the bell crank 7, which is pivotally mounted on the post 8 secured in the frame of the machine. The said link 5 is also pivotally connected about midway its length to the link 9 which is pivotally connected to the upper inwardly projecting'end of the bell crank 10. The said bell crank 10 is pivotally connected at the junction of its members with the outer end of the crank 7 and at its lower end to the key lever 3 as shown in the drawings. The mechanism described comprises what I term a self-con tained flexuring bell crank. The link 9 and upper end of the bell crank lever 10 provide what may be termed a toggle joint be tween the forward end of thebell crank lever 7 and the pivotal connection between the link 5 and the link 9. When the key lever 3 is depressed, the members of the toggle connection are swung out of alinement and into an angular relation, as indicated by dotted lines on Fig. 1, thereby gradually moving the pivotal connection at the lower end of the link 5 toward the pivotal connection between the link 9 and the bell crank lever 10. The link 9 which pulls upon the link 5 thus has its leverage gradu ally decreased, with a corresponding increase in movement, resulting in imparting an accelerated motion to the type bar 2 on the stroke thereof.

Figs. 3 and 4 illustrate the supporting means for the various bell crank levers 7 when a number of the units are assembled in a typewriting machine. disposed plate 22 extends transversely across the key levers 3 at an intermediate point in the length thereof, said plate having the usual curved upper edge 22*. A series of forwardly projecting forked brackets 23 are secured to the. plate 22 adjacent the curved upper edge 22 members, such as the screws 24. The pivot pins 8 upon which the bell crank levers 7 are mounted connect the arms of the respective forked brackets 23. This supporting means enables the necessary number of individual type bar actions to be compactly assembled into a typewriter basket without difficulty.

In Fig. 2 I show a modified form of the accelerating mechanism which comprises the bell crank 11, in all respects similar to crank 10, connected to bell crank 12 which is similar to bell crank.7. A link 13 similar to link 9 is connected to one end of the connecting rod 4 and the opposite end to crank 11 and a link 14 which is connected to said link18 midway its length and to the bell crank 12. It is noted that the bell cranks 7 and 12 are provided with a recess 6 which permits the inwardly projecting member of the cranks 10 and 11 and their connecting links to swing downwardly therein at the finish of the stroke.

Having described my invention what The vertically thereof by suitable fastening I claim: desire to secure Lettets Patent is:

In mefq operat ng the-type bar of a typewritingnlachine,the conibination with a type bar, type bar connecting,

rod, and key lever, of a pair of intersecting.

v rs.p vota ly;iceex ee edet t one of the levers being pivotally connected to the key lever, a link pivotallyconnecting" the opposite leverto the typebar connect- 11 d; len s nd nk; piv l y. Con? necting the first link to; the first mentioned lever; nd. ed to h v a to g c on when the type bar actuated.

in connectionwith the first mentioned lever mentioned crank member and to the type bar connecting r0d,.1n combmatl'on with a linlcpivotally connecting the bell crank and said last mentioned link.

3. In a ftypew'riting' machine, the cOmbi -L nation 'fof a type bar, a key lever, a-b ll crank one member of which is piv'otally secured to saidkey lever, a, bell icrank one member of which is pivotally connectedto saidfirst mentioned crank at the junction of its members, a link, a connecting red one end ofwhieh is connected to the type bar and the'other end to said link, and a: link: pivotally'connected tosaid first mentioned j link, and to the upper member of the first mentioned bell crank. I

4:. In mechanism for operating the type bar "of a typewriting machine, thecombination withla type bar, type bar connecting Go piesoffli is patent may be obtained for five cents-each; by -addressing th'e Commissioner of Patents,-

rod keylever, of a-bell erank pivotally connected at one end thereof to the key lever, a secondbell crank having one end thereofipivotally connected to the middle portion of the first mentioned bell crank, a link member pivotally connecting the oppositeendofthe second bell crank to the type bar connecting rod, and a second link member pivotally connecting the first link member to the opposite end of the first mentioned bell crank. and arranged for cooperation with the'first mentioned-bell crank to producea toggle action upon the first mentionedlink member when the type bar is actuated.

5. In mechanism for operating the type "bar of a typewriting machine, the combination with a type bar, type bar connecting roda'nd key-lever, of a pair of intersecting bellcrank levers one of which is pivotally connected at one end to the other bell crank lever at the junction of the arms thereof, the second mentioned bell crank lever havlng one end thereof pivotally connected to the key-lever, a fixed pivot supporting the first'mentioned' bell crank lever at the intersection of the two arms thereof, a link pivotallyconnecting the opposite end of one ofthe" bell crank lovers to the type bar connecting' rod, and a second link pivotally connecting the first link to the end of the other'bell crank lever.

Intestimony whereof, I have hereunto signedmy name in the presence of two subscribing witnesses.

SYDNEY L. KAUFMAN.

In the presence of.

CLARENCE A.,WILLL\1\1s, JOHN H. HONEY.

Washington, D. G. 

